any structural anomaly of the curved plate of bone that is situated inferiorly to the squamous part and anteriorly to the mastoid part of the temporal bone; it surrounds the external auditory meatus, forming the anterior wall, floor and some of the posterior wall of the bony external acoustic meatus; its lateral border gives the attachment to the cartilaginous part of the external acoustic meatus; its anteroinferior surface forms the posterior boundary of the mandibular fossa
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